Nickel base alloy



Patented Apr. 9, 3.94() ."5 v l estres' stares# rATsN'r orties-* NICKEL BASE ALLOY Russell'Franks, vNiagara Falls, N. Y., assigner. to Haynes Stellite Company, a corporation of Indiana. I

No Dravving. Application November 25, 1938, SerialNo. 242,285

4 claims. (o1.y 'z5-171) This invention relates to corrosion resistant is desirable touse an alloy containing a suballoys and refers more specifically. to nickel base stantialproportion, say 2% to 10%, of iron. allo-ys containing essentially molybdenum or However, iron should not vloe present in an chromium or tungsten or mixtures of two or amount exceeding 25%. `three of such metals, and which may contain iron The' following tablel shows compositions of 5 as an incidental ingredient .or diluent. typical alloys rWithin the-invention and results Alloys of nickel and molybdenum have been of corrosion tests of such alloys, compared with disclosed in Patent 1,375,082, issued to A. W. the results of tests of alloys, otherwise similar, Clement, and alloys of nickel, molybdenum and containing no antimony. f

i iron have been disclosed in Patent 1,710,445, Composition (Temamder nickel and 0 3% 10 issued to F. M. Becket'. My prior Patent vanadium) i 1,836,317, discloses similar alloys containing chromium in addition to the other elements. P P P P Pep Pep P P The resistance of each of those alloys to, Corro' Alloy No. ceet cct ceent cccrt cent cent cgt cet l5 sion is very great, and they have been Widely C, Fe M11 'Si M0 W' Cr` Sb 15 used in the fabrication of articles required to be g l resistant to corrosion. Although their resistance ggg gg gig to hydlfochllric alclid is excellent, ther is a d- 0f 21j? g1g gli g1g ilvTone tiene g 12 man or a oys aving an even grea er resis 0- 20- 011e T011@ 25 2o ance to this acid, and it isa principal object of gjg gi gj 31?, 21g' 20 the present invention to provide such alloys. ggg ,gg gg? The invention is based on my discovery that @09 '5' 0j5 0:6 mg 5 157 Nfme the corrosion resisting properties of nickel base ggf; (7i-7 gg g1g 2 -g g- (1)5 alloys containing molybdenum or chromium or 0:07l 7.5 0:5 013 16:6 4:6 1410 0:25

tungsten or mixtures of two or three of such S1118 gg l? 5 'g 25 metals, and incidental amounts of iron, are 0:06 5 0:6 013 '1719 4 7 1415 21,73 markedly improved by the addition of relatively 0- 12 5 0-5 0-8 1&3 4-7 15 `5-9 small amounts of 'antimony As little asy 0.08% to 0.12% antimony effects a striking improve- Corrosion rate in milligrams per square centiment, and althoughas much as 6% ofthis elemeter yper hour in boiling concentrated aque- 30 ment may be used it is ordinarily neither necesous HCl sary nor desirable that it exceed 0.5%.

The invention is an alloy comprising 10% to HC1 aerated bypassing metal selected from the group consisting Nolaefated HC1 tenuof air through :2,5 of molybdenum, chromium, tungsten, and mix- Alloy No i ou o 35 tmesufereof; between 0'08% arid 6% antlmony; First second Third -First Next Thirdr 51110011 1D 31D amunt not' SXCeed-lng 2%; mangafperiod period period period period period Dese in an amount ngt exceeding Call-bnn y15 hIS. 45 hIS. 521315. 45h15. 45 hlS. 65 his. an amount less than 1%; and the remainder v 4o principally nickel, the nickel content being 3g g- ,19 ,98 *0-9 L0 40 greater than 45%. A preferred range of anti- 1:1 0:9 f mony percentages is 0.2% to 0.5%. Vanadium g-- gg o 3 4 4 *o 6 may also be included, suitably in an amount less d2 o1 05 04 04 than 3%. Preferably, 10% to 25% molybdenum, gg (1)-(1) ,S12 (It (lig 45 3% to '7% tungsten, and 10% to 20% chromium y41o 71o 7.o 41o 7o r 45 are present. -g 'I 1 I Iron may be added to the alloy as a diluent 014 cfs e e, and for the vpurpose of making it more workable gg g- ,94 gg g-,G I at the expense of an unimportant decrease in da 015 0.7 014 os 5o corrosion resistance.` In such a case, it is neces- Z2 3?? 2'2 43 50 sary to strike a balance between an increase in the corrosionsrate and an increase in Workability, *Not tested" y and for certain applications. it is possible to use The valuable increase in resistance to attack an alloy containing no iron or only a minor by hydrochloric `acid imparted'by antimony is amount of iron, While for other applications it apparent from the above examples. While certain specific compositions have been described herein by way of example, the invention is not limited to or by such examples. Thus, it is possible to substitute cobalt for at least a part of the nickel content Without materially aiecting the properties ofthe alloy and without departing from the invention.

I claim:

1. Nickel base alloy comprising 10% to 25% molybdenum; 0.2% to 0.5% antimony; 10% to 25% iron; manganese in an effective amount not over 3%; silicon in an effective amount not: over 2%; vanadium in an amount less than 3%; carbon in an effective amount not in excess of 1%; and the remainder nickel.

2. Nickel base alloy comprising 10% to 20% molybdenum; 3% to '7% tungsten; 10% to 20% chromium; 0.2% to 0.5% antimony; 2% to 10% iron; manganese in an effective amount not over 3% silicon in an elective amount not over 2%; vanadium invan effective amount less than 3%; carbon in an eiective amount not in excess o-f 1%; and the remainder nickel.

3. Nickel base alloy comprising at least one metal of the group consisting of chromium, molybdenum, and tungsten, the total proportion of all such metal or metals being between 10% and 45%; antimony in a proportion, between 0.8% and 6%, effective to improve the resistance of the alloy to corrosion; iron in a proportion not exceeding 25%; manganese in a proportion not exceeding 3%; silicon in a proportion not exceeding 2%; vanadium in an effective proportion not exceeding 3%; carbon in a proportion not in excess of 1%; and the remainder nickel, the nickel content being greater than 45%.

4. Nickel base alloy comprising at least one metal of the group consisting of chromium, molybdenum, and tungsten, the total proportion of all such metal or metals being between 10% and 45%; antimony in a proportion, between 0.08% and 6%, eiective to improve the resistance of the alloy to corrosion; iron in an effective proportion not exceeding 25%; manganese in an effective proportion not exceeding 3%;

silicon in an eiective proportion not exceeding 2%; vanadium in an effective proportion not exceeding 3%; carbon in an effective proportion not in excess of 1%; and the remainder nickel, the nickel content being greater than 45%. 

